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(No Model.)

'P.'W. EAMES.

Air Brake Apparatus.

No. 241,325. Patented May 10, I881;

- Inventor:

N. PETERS, Photo-Lithographer, Washingfion, D. C.

UNITED STATES PATENT OFFICE.

FREDERICK W. EAMES, OF WATERTOWN, NEW YORK.

AIR-BRAKE APPARATUS.

SPECIFICATION forming part of Letters Patent No. 241,325, dated May 10, 1881.

Application filed October 20, 1880. (No model.) Patented in England February 15, 1879.

To all whom it may concern:

Be it known that I, FREDERICK W. EAMEs, a citizen of the United States, residing at Watertowri, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Air-Brake Apparatus, (Case 0 and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part ot'this specification, said invention having been patented tome by the govermnent of Great Britain on the 15th day of February, A. [11879, No. 616. Y

My invention relates to brakecylinders t'or t]uid-pressure-brake apparatus; and it consists of a cylinder provided with two pistons, and having port-openings communicating with the opposite sides of each piston.

It also consists in a novel arrangement of pipes and valve communicating with the main J brake-pipe and the vacuum-spaces ot' the cylv inder, and also with the vacuuni-reservoir.

Figure 1 represents a central vertical sectional view of a vacuum brake cylinder and side elevation of the brake-pipes and vacuumreservoir. Fig. 2 represents an end elevation and partial section of the same.

To enable others skilled in the art to make and use my invention, 1 will now proceed to describe it in detail, omitting a particular description ot'such parts of a brake apparatus as are well known and non-essential to a full understanding of my present improvement.

In the accompanying drawings, A represen ts a cylinder, and is provided with two pistons, B B, which apply the brakes by an outward thrust, or by a pull. These pistons are provided with a suitable air-tight packing, and their pistonrods are also provided with air-tight stuffingboxes; or they may be m a de air-tight where they pass through the cylinder-heads by the flexible sleeves O U, secured at one end to the cylinderhead and at the other to a disk keyed to the piston-rod. The main brake-pipe D has an open connection with the space between the pistons B B, and also with the opposite ends of the pistons, through the'brancli pipes F Fand valve E. At the junction of the branch pipes F F,

beyond the valve E, is fitted a pipe,g, having communication with the reservoir G.

The operation is simple and easily understood, and is as follows: Upon the establishment oi a vacuum in the main brake-pipe I) a vacuum will also be maintained in the cylinder A upon both sides of each piston, a vacuum being formed between the pistons B B through pipe (1, and at the opposite ends of the cylinder through pipes F F, the valve E unseating itself through the action of the exhaust. The reservoir G is put into communication with the exhaust through pipe 9 in the same manner as pipes F F. When, however, it is desired to apply the brakes the vacuum is destroyed in pipe I), which act also destroys the vacuum between the pistons B B in the cylinder A, the valve E instantly closing to prevent its destruction on the other sides of the pistons B B and in the reservoir G, whereby the brakes are at. once put on by the vacuum remaining in the pipes, cylinder, and reservoir beyond the valve E.

This device may be used without employing the reservoir Gr. The same devices, it will be readily understood. may be used for compressed air by merely seating the valve E in the opposite direction from that shown and described.

Having described my invention, what Iclaim as new, and desire to secure by Letters Patent,

1. A cylinder provided with two pistons, in which cylinder apressure is maintained on both sides of each piston, the brakes being applied by destroying the pressure on one or the other side of each piston, substantially as set forth.

2. The combination of cylinder A, pistons B B, pipes (t and F F, and valve E, by means of which a pressure is maintained on both sides of each piston, or destroyed on one or the other side ot'each piston,substantially as and for the purpose specified.

3. In a brake apparatus, the combination of cylinderA, pistons B B, pipes a and F F, valve E,and reservoir G,substantially as and for the purpose specified.

In testimony whereot'l afiix my signature in presence of two witnesses.

FRET). WV. EAMES.

Witnesses:

GHAs. D. BINGHAM, E. D. EAMES. 

